GitHub - pavel-a/usb-relay-hid: Software for USB-connected relays with HID interface. See the WIKI for more info.
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Amazon.com: 5V Drive Free Relay Module 4 Channel Relay Module USB Expansion Board with HID Control Chip : Industrial & Scientific
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Amazon.com: KNACRO SRD-05VDC-SL-C 2-Way 5V Relay Module Free Driver USB Control Switch PC Intelligent Control-Package of 40Pcs : Electronics
![NEW >>> K8090 8-Channel USB Relay Card - PC Related Projects - Whadda forum - Community Help and Support NEW >>> K8090 8-Channel USB Relay Card - PC Related Projects - Whadda forum - Community Help and Support](http://www.velleman.eu/images/tmp/K8090_Demo.png)